Log in review

is there anyway the admin can change the software so that users can stay logged in after they've downloaded and gone back to the main site and picked out another manga. I'm having some trouble with that. Everytime i go to a new manga and come back to the main site and go back to another manga. I have to log out and log in again to download the new manga. I'm only complaining b/c it's a waste of time doing so.